See your screen resolution, OS, GPU, timezone and browser details
What is the Device & Browser Info?
The device & browser info works like this: it reads back every capability your browser exposes about your current setup: screen and viewport dimensions, pixel ratio, colour depth and dark-mode preference, platform and CPU/memory hints, GPU renderer, user agent and languages, timezone, connection quality and cookie/DNT states - grouped and copyable as JSON for support tickets. Everything happens on your device - the input never leaves your tab unless the tool clearly states it performs a server-side lookup.
How to use the Device & Browser Info
Open the tool - it reads your environment automatically and refreshes every 5 seconds.
Scan the Display group first when debugging layout: screen resolution vs viewport vs pixel ratio tell you what CSS actually sees.
Check the Locale & Time and Browser groups when a site behaves oddly - wrong timezone or a stale user agent explains most "impossible" bugs.
Use Copy as JSON to attach the full snapshot to a bug report in one paste.
Features
All five display numbers side by side - screen, available area, viewport, DPR and the physical approximation
GPU renderer via WebGL introspection, the same string game engines and video-call apps read
Effective connection type and downlink estimate from the Network Information API
One-click JSON export formatted exactly like a support desk expects
Common mistakes to avoid
Confusing screen resolution with viewport - responsive layouts only react to the viewport (window size), never the full screen
Reading deviceMemory as your actual RAM - browsers deliberately report a rounded, capped approximation for privacy
Treating the user agent as gospel - it can be spoofed, and browsers are freezing its format; the platform field and feature checks are more reliable
Pasting the full JSON publicly without reviewing it - it contains your timezone, language and precise screen size, which is usually fine but is your call
Answering "what is my screen resolution" instantly
Attaching an accurate environment snapshot to bug reports
Debugging responsive layouts: screen vs viewport vs DPR side by side
Seeing exactly how much browsers reveal about you without permission
Privacy
This tool displays your own browser data back to you and nothing more - no transmission, no logging, no storage. Copying it anywhere is entirely your action.
Frequently asked questions
What is my screen resolution really telling websites?
Just the numbers: width, height, colour depth and pixel ratio. Not your name, location, or anything on your screen. This page makes that visible precisely so you can see how little - and how much - a site can know without permission.
Why does viewport differ from screen resolution?
The viewport is the part of the page actually visible inside the browser window - subtracting toolbars, scrollbars and the OS taskbar via "available area". Media queries and responsive design respond to the viewport only.
What is device pixel ratio (DPR)?
How many physical screen pixels make one CSS pixel. On a 2x DPR laptop, 1920 CSS pixels are rendered on 3840 hardware pixels. Getting DPR wrong is the classic cause of blurry images and tiny-looking fonts on modern displays.
Can I hide this information?
Partly. The serious privacy lever is fingerprinting resistance: browsers such as Firefox with resistFingerprinting or Tor Browser report generic values. User-agent spoofing alone changes one field while everything else still identifies you.
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